encompassing physiological wellness, neuromuscular status, fluctuations in body mass, and athlete ratings of their recovery and readiness to train. Unpublished data in a male World Sevens Series cohort show that indices of exercise heart-rate recover at a different rate from peak velocity on a verticaljump

Eric S. Rawson, Mary P. Miles and D. Enette Larson-Meyer

supplementation on muscle function have been described as equivocal, with discrepancies in research in part caused by differences in baseline 25-hydroxyvitamin D concentrations prior to supplementation ( Close et al., 2016 ). For example, Close, Russell, et al. ( 2013 ) showed improved sprint time and vertical

. The CMJ was performed with both hands on the waist, while performing a downward movement until about 90° of knee flexion followed by a maximal verticaljump. All participants were instructed to land in an upright position to ensure similar body configuration for takeoff and landing. The participants